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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7ee8bdb86b7c00dc92006d1fa011cd46f7ef1d95bef9d6d78f8f56e458fbfd0' 
  AND token = '1mtxLde9/j4lycXoIQmLsIZU5/UA+lUXVespiRUpjbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}